Last Updated
:2025/12/07
第三紀
Hiragana
だいさんき
Proper noun
Japanese Meaning
地質時代区分の一つで、中生代と第四紀の間に位置する時代。現在では新生代を古第三紀・新第三紀・第四紀に区分する、あるいは古第三紀と新第三紀を合わせた非公式な呼称として用いられる。 / 古気候・古生物・地層形成などを論じる際に用いられる時代名で、おおよそ約6600万年前から約260万年前までを指す。
Easy Japanese Meaning
むかしの地球の時代のなまえで、新生代のはじめから中ごろまでの長いきかん
Sense(1)
the Tertiary period
( canonical )
( romanization )
( hiragana )
Quizzes for review
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第三紀
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The Tertiary period was a very important time in the history of the Earth.
The Tertiary period was a very important time in the history of the Earth.
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第三紀は地球の歴史の中で非常に重要な時期でした。
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